JPS6058432B2 - Interval pulse generator corresponding to logarithmic value of time - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for generating pulse signals at equal intervals corresponding to the logarithm of time over a wide time range with high precision.

In general, in elucidating various phenomena, it is extremely important industrially to track, observe, and record the phenomena over time, and various methods have been used in the past.

Among them, the phenomena called transient phenomena or relaxation phenomena have a characteristic that the rate of change is extremely large in the initial stage, then gradually decreases with time, and finally the rate of change asymptotically approaches zero or a constant value.

When tracking this type of phenomenon, the following two cases can be considered in determining the measurement interval.

First of all, when focusing on the period of time when the rate of change is large in the early stages, the measurement interval needs to be short, and this means that the amount of data obtained when continuously measuring over a long period of time becomes enormous. means. Moreover, apart from the initial data obtained, each piece of data has a small amount of information, which only increases the complexity of analysis. Conversely, if you take a long measurement interval to avoid this, the total number of data will be much smaller than the former, but the number of initial data containing a lot of useful information will be extremely scarce, resulting in inefficient measurement. Become. As is clear from what has been said above, it is inappropriate to carry out measurements at equal time intervals for tracking a series of phenomena, such as transient phenomena or relaxation phenomena.

Generally, when analyzing such phenomena, the rate of change or the amount of change is treated as a function of the logarithm of time.

It is an object of the present invention to provide an apparatus for generating equally spaced pulse signals corresponding to the logarithm of time necessary to track or record such phenomena in a rational and efficient manner. Therefore, the following points are required for a device that generates pulses at equal intervals corresponding to the logarithm of time. (1) If the phenomenon to be measured takes a relatively short time, pulses with short intervals are naturally necessary.
Therefore, the logarithmic conversion circuit must be fast and highly accurate.

(2) If the phenomenon to be measured lasts for a relatively long time, pulses with long intervals are required, and therefore the logarithmic conversion circuit does not need to be fast, but must be highly accurate.

(3) In either case, pulses must be generated over a wide range of time.

A pulse generating circuit with equal intervals that corresponds to the logarithm of time that satisfies the above points has not been obtained so far, and in general, data is obtained using pulse signals with equal time intervals and then analyzed. At times, they were used selectively depending on the purpose.

According to the present device, it is possible to satisfy the above points and avoid generating equally spaced pulses corresponding to the logarithmic value of the required time.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an example of an embodiment of the present invention, which mainly includes a crystal oscillator 1 that performs accurate oscillation regardless of changes in the external world, and a time selector * that prespecifies the generation range of time pulses from the crystal oscillator 1. ``'2, a logarithmic conversion circuit 3 that converts the number of pulses into a logarithmic value by combining frequency division and comparison, an interval selector 6 for specifying the pulse generation interval in advance, and a pulse count by specifying the time selector 2 and the interval selector 6. The apparatus includes a pulse generating circuit 5 that generates a pulse generating circuit 5, and additionally includes a start/reset circuit 7, a display section 4 that displays a logarithmic value of time, etc. The signal is expressed by the following formula: 10gt (seconds) = A + B, where t is the time in seconds from the start of the measurement until the signal is generated, and A
is the two-digit number (a) displayed on the device. 0-6.0)
, B are coefficients that determine the measurement range and are specified by the time selector 2.

In addition, the pulse generation interval Δ10gt from the pulse generation circuit 5
can be specified by the interval selector 6 as either 0.1 or 0.2. Further, the n-th pulse is generated 10 (°-0610g') 4 seconds after inputting the start signal. Table 1 shows the measurement range. This will be explained with reference to the drawings.

(1) The input pulse signal 8 passes through the input gate 9 controlled by the start/reset circuit 7 and is applied to the initial value counter 10 and the integration gate 12.

(2) When a predetermined number of input pulse signals 8 are received, the initial value counter 10 operates the gate signal generation circuit 11 to open the integration gate 12, while setting the logarithmic value counter 17 to O.

(3) When the integration gate 12 opens, the input pulse signal 8 passes through the frequency dividing circuit 13 and is integrated into the integration counter 15.

The frequency division circuit 13 is controlled by a frequency division selector 14, and the index value of the logarithm counter 17 is 0, 1, 2, . . .
As it changes, it becomes 1,1110,11100...
The frequency of the input pulse signal 8 is divided as follows. That is, when the logarithm value increases by 1, the human pulse signal is counted by dropping one digit. (4) The diode matrix 18 contains a value obtained by subtracting a predetermined number determined by the initial value counter 10 from the antilog number corresponding to the mantissa for the number of steps of the mantissa, and the value of the mantissa of the logarithm counter 17 The selector 19 operates and the corresponding numerical values are successively displayed. (5) The comparison circuit 16 compares the content of the integration counter 15 and the content of the diode matrix 18 in parallel, and if they match, increases the mantissa part of the logarithm counter 17 by one step.

As described above, the apparatus of the present invention uses frequency division and comparison to perform logarithmic transformation, so it has the advantage of being able to achieve both high speed, high precision, and high range.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the apparatus of the present invention, and FIG. 2 is a block diagram of its logarithmic conversion circuit. 1...Crystal oscillator, 2...Time selector, 3...
Logarithmic conversion circuit, 5... Pulse generation circuit, 6... Interval selector, 7... Start/reset circuit, 8...
Input pulse signal, 9... Input gate, 10... Initial value counter, 11... Gate signal generation circuit, 12.
... Integration gate, 13... Frequency division circuit, 14... Frequency division selector, 15... Integration counter, 16... Comparison circuit, 17... Logarithm 1 value counter, 18... Diode matrix , 19... Matrix selector.

Claims (1)

[Claims] 1 A crystal oscillator circuit that generates pulses at fixed time intervals, a time selector that selects the generation range of the generated time pulses, and a system that converts the number of time pulses into logarithmic values by combining frequency division and comparison. An interval pulse generator corresponding to a logarithmic value of time, comprising a logarithmic conversion circuit and a pulse generating circuit that generates a pulse every time the logarithmic value changes.